Horst Sprenger Rod Metering Systems and Assemblies EN
EDGE DOCTOR CONTROLLED COATING OF FILM Due to production factors, the coated film must be wider than the sheet. This results in an "excessively" applied coat in the edge area of the rolls that must be removed in order not to impair production. Usually, the coat from the edge area is removed by trailing blades. This technology is widely used but outdated; this can easily be explained with the laws of physics and mechanics: • High forces must be exerted to reliably remove the excess media. • High forces cause extensive wear to the blade; the function can decrease uncontrollably. • The arrangement of the blade leads to a converging gap which acts like a “trap” for agglomerates and fibers. These can grind into the roll and thus increase roll wear. Problematic conventional edge doctoring The advantages of edge doctors Our edge doctors have already proven themselves in numerous applications in the paper industry. The edge doctor is configured for optimal performance, without penetrating the roll. The required contact pressure is provided by the net weight of the blade alone. This design principle uses the leverage of a doctor much more efficiently and offers numerous advantages: • Uniform contact pressure • Compensated blade wear • „Soft“ PE blade protects the roll • Change can be performed on running machine • Functional catch box • Improved functionality • Tried and tested throughout the world • Additional sealing blade for increased cleanliness Our edge doctor solution
SEALING DOCTOR THE NEW ONE-PART SEALING DOCTOR SOLUTION The coating is usually supplied via a metering chamber, which is designed differently depending on the type. This metering chamber is sealed towards the coating roll with a slotted sealing blade or an overflow bar with a gap. Both systems have existed side by side for a long time and are largely determined by the choice of the machine manufacturer. The overflow gap requires a relatively large surplus in the coating chamber to seal it against air entrapment. However, the function of the overflow gap system is highly dependent on the thermal and mechanical stability of the coating station. The sealing blade manages with much lower circulation rates and is much less dependent on thermal influences and mechanical deviations. The major dis advantage of the sealing blade is its safety: As the blade tip grinds on the coating roll, the blade becomes razor sharp over time. This can lead to serious cuts - not only when changing the blade, but also when changing the rod metering system. Simply better – the new sealing doctor As a one-piece, slotted sealing element, our sealing doctor works virtually wear-free. It has an improved cleaning effect on the coating roll, which results in fewer rod streaks caused by particles from the return film. Above all, it offers an enormous advantage in terms of occupational safety, as there are no sharp edges. Coating chamber with new chamber seal
- Page 1 and 2: ON THE MOVE FOR THE PAPER INDUSTRY
- Page 3 and 4: SMOOTH AND PROFILED METERING RODS M
- Page 5 and 6: PROFILED METERING RODS VOLUMETRIC M
- Page 7 and 8: WELL-KNOWN PARTNER, NEW COMPETENCIE
- Page 9 and 10: CHROME, CERAMIC, CARBIDE SPECIALIST
- Page 11 and 12: MATERIALS THE RIGHT ONE FOR EVERY P
- Page 13 and 14: V-Baureihe V-Baureihe V-Baureihe B-
- Page 15 and 16: DIRECT DRIVE WITH QUICK COUPLINGS S
- Page 17: AUTOMATIC COUPLING COUPLING, AS IF
- Page 22 and 23: FOCUS ON THE PAPER INDUSTRY TARGETE
- Page 24: www.ibs-ppg.com DO YOU HAVE ANY QUE
EDGE DOCTOR<br />
CONTROLLED COATING OF FILM<br />
Due to production factors, the coated film must be wider than the sheet. This<br />
results in an "excessively" applied coat in the edge area of the rolls that must<br />
be removed in order not to impair production.<br />
Usually, the coat from the edge area is removed by trailing blades. This technology<br />
is widely used but outdated; this can easily be explained with the laws of<br />
physics <strong>and</strong> mechanics:<br />
• High forces must be exerted to reliably remove the excess media.<br />
• High forces cause extensive wear to the blade; the function can decrease<br />
uncontrollably.<br />
• The arrangement of the blade leads to a converging gap which acts like a<br />
“trap” for agglomerates <strong>and</strong> fibers. These can grind into the roll <strong>and</strong> thus<br />
increase roll wear.<br />
Problematic conventional edge doctoring<br />
The advantages of edge doctors<br />
Our edge doctors have already proven themselves in numerous applications<br />
in the paper industry. The edge doctor is configured for optimal performance,<br />
without penetrating the roll. The required contact pressure is provided by the<br />
net weight of the blade alone. This design principle uses the leverage of a<br />
doctor much more efficiently <strong>and</strong> offers numerous advantages:<br />
• Uniform contact pressure<br />
• Compensated blade wear<br />
• „Soft“ PE blade protects the roll<br />
• Change can be performed on running machine<br />
• Functional catch box<br />
• Improved functionality<br />
• Tried <strong>and</strong> tested throughout the world<br />
• Additional sealing blade for increased cleanliness<br />
Our edge doctor solution
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